'Water of Life' in the Bible

And He said to me, "It has come to pass. I am the Alpha and the Omega, the Beginning and the End. I will give to him that thirsted of the fountain of the water of life freely.

And he showed me a river of water of life, bright as crystal, issuing forth out of the throne of God and of the Lamb,

"And the Spirit and the bride say, 'Come'; and let him that hears say, 'Come'; and let him that thirsts say, 'Come'; he that will let him take the water of life freely.